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It sounds like you are right on track! The acid will lower the PH to around 7.0, and with some aeration and repetition you bring the TA down. FC will go up to about 2.5 from the chlorine, which is appropriate without any CYA and should start to take care of the CC. I would monitor the FC level fairly closely. If you have algae, which is likely, you may need to raise it several times before you beat the algae.

Will I have trouble testing my CYA level since the TF100 starts at 20?

A little bit but it's not too troublesome. The important thing is to calculate your dosage as carefully as you can for your size pool. The CYA test is really only accurate for around + or - 10ppm so your accuracy with the dose will be a better indicator than the test. Keep in mind it will not show up on the test for as long as a week after you add it so don't test right away.